Azca
If there is a harder way - I will find it...
Toyota FIPG. Gear oil. Drain plug gasket. That's it. For the UD gears, IIRC, you need to modify the transfer case internals. A little cutting and grinding and you are done.For those that have installed gears but not done a full rebuild on the case what are the must have pieces that have been found necessary save any damages to bearings/races/shafts found once inside.
Or what pieces should be replaced to effectively open up and reseal the case. Seals, gaskets, one time use items, etc?
I was paranoid so I ran it 500 miles and changed the gear oil again.